I'd like to know the very same thing. I'll give Tom Newbie a call at Powerboat and ask what he is using now.
I spoke to a photographer from the Daytona newspaper at last year's race. When I saw the equipment he was using (Nikon D4), I went right over to him and gave him the third degree. He said that the top of the line digital SLR's function the same as any SLR camera that uses film. I never used the camera, so I can't say for sure. If you can shoot ice hockey (low light/high speed) with it, you can shoot anything. I WANT that camera.
Maybe we can get a good deal if we purchase them together - Canon/Nikon/Minolta, any good SLR. FYI: as of last year, Minolta was the only one that had the zoom/tilt flash available. Just something to think about. I'm sure we can get one aftermarket.